(1 of )Firefighters from Schell Vista and Santa Clara Cal Fire prepare to put out hotspots on a fire in the hills of Soda Canyon in Napa Valley, Friday Nov. 23, 2013. The fire grew to over 300 acres by daybreak, fanned by high winds. (Kent Porter / Press Democrat) 2013

(2 of ) Fire rages along the slopes of the Geysers geothermal field, Friday Nov. 22, 2013 just off Geyser Road east of Geyserville. High winds fanned the blaze to an estimated 900 acres, with power lines reportedly down in the area. Several county strike teams as well as Cal Fire were on hand to fight the fire. (Kent Porter / Press Democrat) 2013

(3 of ) Fire rages along the slopes of the Geysers geothermal field, Friday Nov. 22, 2013 just off Geyser Road east of Geyserville. High winds fanned the blaze to an estimated 900 acres, with power lines reportedly down in the area. Several county strike teams as well as Cal Fire were on hand to fight the fire. (Kent Porter / Press Democrat) 2013

(4 of ) A wind driven fire seen from the Silverdado Trail fire in the hills of Soda Canyon in Napa Valley, Friday Nov. 23, 2013, grew to over 300 acres by daybreak. (Kent Porter / Press Democrat) 2013

(5 of ) A Cal Fire truck heads to the Geysers geothermal field, Friday Nov. 22, 2013 just off Geyser Road east of Geyserville. High winds fanned a blaze to an estimated 900 acres, with power lines reportedly down in the area. Several county strike teams as well as Cal Fire were on hand to fight the fire. (Kent Porter / Press Democrat) 2013

(6 of ) Fire rages along the slopes of the Geysers geothermal field, Friday Nov. 22, 2013 just off Geyser Road east of Geyserville. High winds fanned the blaze to an estimated 900 acres, with power lines reportedly down in the area. Several county strike teams as well as Cal Fire were on hand to fight the fire. (Kent Porter / Press Democrat) 2013

(7 of ) Fire rages along the slopes of the Geysers geothermal field, Friday Nov. 22, 2013 just off Geyser Road east of Geyserville. High winds fanned the blaze to an estimated 900 acres, with power lines reportedly down in the area. Several county strike teams as well as Cal Fire were on hand to fight the fire. (Kent Porter / Press Democrat) 2013

(8 of ) Fire rages along the slopes of the Geysers geothermal field, Friday Nov. 22, 2013 just off Geyser Road east of Geyserville. High winds fanned the blaze to an estimated 900 acres, with power lines reportedly down in the area. Several county strike teams as well as Cal Fire were on hand to fight the fire. (Kent Porter / Press Democrat) 2013

(9 of ) A fire burns in the rugged hills of Soda Canyon in Napa County, Friday Nov. 23, 2013. High winds fanned the fire to nearly 300 acres by early morning, visible from the Silverado Trail. (Kent Porter / Press Democrat) 2013

(10 of ) Firefighters from Schell Vista and Santa Clara Cal Fire prepare to put out hotspots on a fire in the hills of Soda Canyon in Napa Valley, Friday Nov. 23, 2013. The fire grew to over 300 acres by daybreak, fanned by high winds. (Kent Porter / Press Democrat) 2013

(11 of ) Fire rages along the slopes of the Geysers geothermal field, Friday Nov. 22, 2013 just off Geyser Road east of Geyserville. High winds fanned the blaze to an estimated 900 acres, with power lines reportedly down in the area. Several county strike teams as well as Cal Fire were on hand to fight the fire. (Kent Porter / Press Democrat) 2013

Napa County wildfire 80 percent contained

BRETT WILKISON

THE PRESS DEMOCRAT | November 23, 2013

A wildfire in Napa County that had threatened up to 50 homes on Friday and destroyed one outbuilding has been largely contained, with firefighters strengthening their lines and performing mop-up operations around the blaze.

Dubbed the Silverado fire, it was burning east of Napa and remained at 300 acres at 2 p.m., with 80 percent containment and 150 firefighters assigned.

The fire, first reported late Thursday, spread through oak forest and grassland in the hills east of Silverado Trail. It threatened homes in the Soda Canyon Road area, triggering an evacuation order that was lifted just before 6 p.m. Friday.

The cause of the blaze was under investigation, though law enforcement officials said downed power lines were suspected.